To cut drywall effectively and achieve clean, straight edges, follow these steps:
- Gather Your Tools
You will need a utility knife with a sharp blade, a measuring tape, a pencil, a drywall square or straight edge, and optionally a rasp for smoothing edges
- Measure and Mark
Measure the area where the drywall will be installed. Mark the cut line on the drywall sheet using a pencil and a drywall square or straight edge to ensure a straight line. Mark both the top and bottom if needed, especially for large pieces or uneven walls
- Score the Drywall
Place the drywall square along the marked line. Using the utility knife, score the drywall paper along the line with enough pressure to cut through the paper and slightly into the gypsum core. It's best to run the knife twice for a clean score
- Snap the Drywall
Move the scored line to the edge of your work surface or hold the drywall on its edge. Apply firm, even pressure to snap the drywall along the scored line. The drywall should break cleanly where scored
- Cut the Backing Paper
After snapping, use the utility knife to cut through the paper on the back side of the drywall to separate the pieces completely
- Smooth the Edges (Optional)
Use a drywall rasp or sanding block to smooth any rough edges for a better fit and finish
Additional Tips:
- Change your utility knife blade frequently to ensure clean cuts and reduce effort
- Avoid using your knee to hold the square in place to prevent injury; instead, hold it firmly with your hand or foot
- For cutting holes or irregular shapes, a drywall saw or oscillating multi-tool can be used, but these produce rougher edges and more dust
This method, often called the "score and snap" technique, is the most common and efficient way to cut drywall for straight cuts and is widely used by professionals and DIYers alike
